Internal combustion engine



FIG. 1 is a front elevational view of an internal combustion engineshowing our new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a front elevational view of an internal combustion engineshowing a second embodiment of our new design;

FIG. 8 is a rear elevational view of FIG. 7;

FIG. 9 is a right side elevational view of FIG. 7;

FIG. 10 is a left side elevational view of FIG. 7;

FIG. 11 is a top plan view of FIG. 7;

FIG. 12 is a bottom plan view of FIG. 7;

FIG. 13 is a front elevational view of an internal combustion engineshowing a third embodiment of our new design;

FIG. 14 is a rear elevational view of FIG. 13;

FIG. 15 is a right side elevational view of FIG. 13;

FIG. 16 is a left side elevational view of FIG. 13;

FIG. 17 is a top plan view of FIG. 13;

FIG.18 is a bottom plan view of FIG. 13;

FIG. 19 is a front elevational view of an internal combustion engineshowing a fourth embodiment of our new design;

FIG. 20 is a rear elevational view of FIG. 19;

FIG. 21 is a right side elevational view of FIG. 19;

FIG. 22 is a left side elevational view of FIG. 19;

FIG. 23 is a top plan view of FIG. 19; and

FIG. 24 is a bottom plan view of FIG. 19.

The ornamental design for an internal combustion engine, as shown anddescribed.